Dust trail of 109P/Swift-Tuttle in 2005

By Mikiya Sato

109P/Swift-Tuttle is parent comet of Perseids.
I calculated distributions of trails of 109P in 2005.

In 2005

EjectionYear

Date(UT)

Time

Sol.Long.(2000)

delta-r(AU)

Ejectionvelocity(m/s)

delta-a(AU)

fM

R.P.

V(km/s)

Notice.

Alp.

Del.

1862

Aug.12.10

02:18

139.414

+0.0048

+23.09

1.583

1.0

45.95

+57.73

59.32

so far

1737

Aug.12.08

01:56

139.400

+0.022

+20.63

1.326

0.52

46.16

+57.38

59.08

so far

1610

Aug.12.23

05:35

139.546

+0.0098

+11.70

0.758

0.035

45.92

+57.51

59.31

so far

1479

Aug.12.37

08:58

139.681

-0.00087

+4.88

0.322

0.0062

45.87

+57.67

59.49

small fM

1348

Aug.12.45

10:46

139.753

+0.0013

+2.22

0.147

0.0022

45.92

+57.71

59.43

small fM

1212

Aug.12.46

11:00

139.762

+0.0017

+1.15

0.078

0.00095

45.89

+57.72

59.41

small fM

In this year, trails of a good condition do not exist.
New trails (1862, 1737 and 1610) are far from the earth orbit.
The trail of 1479 is very near as -0.00087 AU. But the value of fM is very small as 0.0062 because of the perturbation of Jupiter in 1872. This part of trail is very extended and a density of dust is very thin. So the peak is not observable level. Older trails (1348 and 1212) are also the same as the trail of 1479.

In 2004, the trail of 1862 gave a sharp peak. But in 2005, the peaks of trails will be not observal. We should pay attention to "normal peak" (Sol.long. : about 140.0).

Link

2005 Perseids
Jeremie Vaubaillon's page. There is a more detailed chart of dust distribution.